The controlled group in the scenerio is Group B who recieves the placebo while the experimental group would be group A who recieves the supplement. The independednt variable is the placebo group because the information about them should stay the same regardless. The dependent variable is the herbal supplement.
Scenerio 2:
The scenerio is identifying whether being a tall woman has any effect on having a strong carreer orientation. With her survey she finds out that her data supports this.